3 What is Ultrasound? The upper limit of hearing : about 20[kHz]Over the upper limit = Ultrasound ?This definition is not clear..“Ultrasound is a sound whose utility value is not to hear”Application to diagnosisFrequency : 2MHz – 10MHz

4 Physics of ultrasound - propagation -Velocity of propagationAbout 1540[m/s] in human bodyEach tissue has its own velocity.Ultrasonic diagnostic equipment assumes that sound velocity is constant in the body.This assumption causes artifacts in echo imageWavelengthAbout 0.437[mm] in the body (3.5MHz)

11 Ultrasonic echo imaging - basic principle-Same principle as echo among the hills.Estimate the distance from the sound reflection and the sound velocity.Ultrasonic ProbeReflectedSignalUltrasonicBeamHumanBody

About project

Feedback

To ensure the functioning of the site, we use cookies. We share information about your activities on the site with our partners and Google partners: social networks and companies engaged in advertising and web analytics. For more information, see the Privacy Policy and Google Privacy &amp Terms.
Your consent to our cookies if you continue to use this website.